Portable electric combination drill



Nov. 20, 1923.

H. ATHENAS PORTABLE ELECTRIC COMBINATION DRILL 2 Sheets-Sheet 1 Filed March 16 1920 w MN Nov. 20,1923. 1,475,153 H. ATHENAS PORTABLE ELECTRIC COMBINATION DRILL Filed March 16, 1920 2 Sheets-Sheet 2 Patented Nov. 20, 1923.

PATENT OFFICE.

HARRY ATHENAS,.OF NEW'YORK, N.

PORTABLE ELECTRIC COMBINATION DRILL.

a ncaudii filed March 16,}1920. Serial No. 366,381.

To all whom it may concern:

Be it known that I, HARRY ATHENAs, citizen of the United States, residin' at New York city, in the county of New ork and State of New York, have invented certain new and useful Improvements in Portable Electric Combination Drills, of which the following is a specification.

This invention relates to a tool holder and more particularly to a portable electric combination tool holder of the general type known as electrically operated breast drill.

. One of the objects of the present invention is to provide a simple, practical and self contained drill or tool holder of the above general character which may be inexpensively manufactured and assembled.

A further object is to provide a device'of the above general character in which changed speeds may be easily and quickly obtained.

A further object is to provide an improved combination device with self contained grinding wheel attachment.

A further objectis to provide a device of the above character which may be easily and conveniently handled and controlled.

A further object is to provide removable partswherebythe mechanism may be easily and conveniently cleaned or worn and broken parts removed and replaced as may be necessary.

Other objects will be in part obvious and in art hereinafter pointed out.

eferring now to the drawings in detail,

Figure 1 is a sectional, 'elevational view of one part of the tool holder.

Figure 2 is a semi-diagrammatic cross sectional view through the center.

Figure 3 is-a detail view showing a part of the change speed mechanism.

Figure 4 is a transverse sectional view near one end.

Figure 5 is a detail View, partially in section, showing a handle and control mechanism.

Figure 6 is a cross sectional view through Figure 5.

Figure 7 is a detail elevational view of one of the handles.

portion of the main casing provided with a power shaft 7 having a high powered pinion 23 meshing with a pinion 9 on a parallel shaft 8, the shafts 7 and 8 being mounted in suitable bearings and the latter shaft 8 being provided with high and low geared pinions 4. and 5. adapted to mesh with pinions 16 and 17 on a shaft 26 carried in the upper part of the forward wall- 18 of the casing chamber or member abutting a flange 20 on the main casing 6 and being secured thereto in any desired manner as by means of screws 57. The shaft 26 extends forwardly through a suitable supporting lug and is provided with a tool chuck 15 adapted to carry any suitable form of bit or drill. Roller bearings 61 are provided as may be necessary. The gears Land 5 mounted upon the shaft 8 may be moved longitudinally in any desired manner such, for example, as by means of worm 2 meshing with a rack 14 and operated by knob 10. As this worm is turned, the gears 4 and 5 are thrown into and out of engagement with the pinions 16 and 17 and by slightly enlarging the chamber in which these gears are mounted both may be thrown out of mesh thereby cutting out the rotation of the shaft 26.

Referring more particularly to Figure 1 showing the central part of the casin 6, there is mounted a motor 38 of any desired type provided with a fan 35 for keeping the same cool and also expelling any dust that may otherwise leak into the chamber. The usual brushes 39 coact with the commutator and are adapted to be connected in any desired manner to a suitable source of electric current. trolled preferably by means of an ordinary two button contact switch as shown in the upper part of Figure 1 or in the detail view, Figure 5, the handles 46 and 53 being screwed into suitable lugs 41 at the sides of the casing whereby the device may be grasped byboth hands of the operator when in use.

The end of the armature shaft is provided with a grinding wheel 30 adjacent which is a tool rest 56. By removing the cover plate 27 attached by means of chain 55 to the body of the casing 6 the grinding wheel may be used for sharpening the drills or other tools used. The cover 27 is provided with a breast plate 34 substantially as shown in Figure 8. The partition separating the motor chamber from the grinding wheel chamber is provided with a plurality of openings 28 as shown more clearly The rotation of the motor is conin Figure 4 through which air is driven to carry off any dust emanating from the grinding wheel when in use. The entire mechanism is provided with oil ducts such as indicated in the several figures and va rious attaching means so that the entire mechanism may be easil and quickly assembled or disassemble at short notice when it is desired to replace worn or broken parts or make adjustments.

In Figure 7 it will be seen that one of the handles 53 is provided with a bent over end through which any suitable form of clamping means, such as the screw 50 provided with handle 29 and clamping plate 51 may be used to engage a suitable support such as indicated by the block of wood between the plate and the side of the casing.

'In this manner the device may be mounted on a work bench and either the grinding wheel or the tool holder operated in relatively fixed position.

The operation of the device is substan tially as follows 2-- When used as a drill the tool is inserted into chuck 15 and the motor started by operating the switch 40, the entire device being grasped by the handles 53 and held against the breast of the operator in the customary manner. By ressing the stop button of the switch the device is instantly brought to rest.

If a change of speed is desired then the setting knob 10 is adjusted to the proper position to bring the desired speed gears into mesh or entirely out of mesh if so desired. This is preferable, of course, when the cover 27 is removed and the motor is used as a means for driving the grinding wheel.

From the above it will be seen that the present invention provides a simple, ractical, compact and self contained com ination tool holder adapted to accomplish, among others, all of the objects and advantages herein set forth.

What I claim is 1. In a breast drill tool holder, in combination, a casing provided with a motor andmotor shaft, a" tool holder intervening,

reducing and change speed gears between 1 mally protecting said grinding wheels and a fan within said casing adapted to cool the motor and blow away the dust emanating from said grinding wheel when in oper ation.

3, In a breast drill tool holder, in combination, a casing provided with handles, one of which constitutes a clamp, a motor within said casing, tool holder driven by said motor and a grinding wheel at the opposite end of the motor shaft.

4. In a breast drill tool holder, in combination, a tool holder, having a casing, a handle associated with said casing having a bent over end carrying clamping means whereby the tool holder may be mounted on any suitable support in relatively fixed position. U In testimony whereof I have afiixed my signature.

. HARRY ATHENAS. 

